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ITC-IDV Workshop for NGIC  > Accessing and Displaying Data > Displaying Satellite and Level III Radar Imagery
3.6.0 Loading Satellite Imagery
Satellite imagery from geostationary and polar orbiting satellites is available through a network of servers supported by ITC and Unidata. Most of the imagery available on these servers cover the North America, Europe, and Asia. The Indian region is less well represented. These servers use the Abstract Data Distribution Environment (ADDE) protocol.

First, we'll load in some near-realtime visible imagery from The Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard the Aqua and Terra spacecrafts archived at ITC and ingested by the NOAA bentpipe server (nanuk.eosdis.nasa.gov):

The Level One format data (raw sensor counts, sensor-calibration, and geolocation information) is already converted into Level-1b format (MOD02), which significantly reduces storage and CPU-processing time at the ICC LDM server. The following three data groups will be disseminated to the LDM/OpenADDE server located at each location at ICC/Aimag-level:

1.    Earth view at 250m resolution, contains the 250m bands only (1, 2 in that order)
2.    Earth view at 500m resolution, contains the 500m bands (3 to 7). It also contains the 50m bands resampled to 500m.
3.    Earth view at 1km resolution, contains the 1km bands split into two categories: Reflective (8 to 12, 13low, 13high, 14low, 14high, 15 to 19, 26) and Emissive (20 to 25, 27 to 36). It also contains the 250m and 500m bands resampled to 1km.

For this workshop, we limit the sample MODIS data covering Mongolia to data group 3, band 1 and 2. This is to limit memory requirements as we are working with large timeseries and somewhat outdated PC's. Below you will find a listing of the availble channels for a given MODIS scene:

 Grp Satellite/         Date       Time      Center      Res (km)   Image_Size                                        
     sensor                                 Lat  Lon    Lat   Lon                                                     
 --- -------------  ------------  --------  ---- ----  ----- ----- ------------                                       

   3  AQUA-L1B      21 JUL 06202  07:15:00    59  -80                                                                 
   Band: 1    0.6465 um Land/Cloud Boundaries           1.01  1.01  2030 x 1356                                       
   Band: 2    0.8567 um Land/Cloud Boundaries           1.01  1.01  2030 x 1356                                       
   Band: 3    0.4656 um Land/Cloud Properties           1.01  1.01  2030 x 1356                                       
   Band: 4    0.5537 um Land/Cloud Properties           1.01  1.01  2030 x 1356                                       
   Band: 5    1.2419 um Land/Cloud Properties           1.01  1.01  2030 x 1356                                       
   Band: 6    1.6291 um Land/Cloud Properties           1.01  1.01  2030 x 1356                                       
   Band: 7    2.1143 um Land/Cloud Properties           1.01  1.01  2030 x 1356                                       
   Band: 8    0.4118 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 9    0.4421 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 10   0.4869 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 11   0.5297 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 12   0.5468 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 13   0.6656 um lo Ocn Color/Plankton/Biogeoch  1.01  1.01  2030 x 1356                                       
   Band: 14   0.6767 um lo Ocn Color/Plankton/Biogeoch  1.01  1.01  2030 x 1356                                       
   Band: 15   0.7464 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 16   0.8662 um Ocn Color/Plankton/Biogeochem   1.01  1.01  2030 x 1356                                       
   Band: 17   0.9041 um Atmospheric Water Vapor         1.01  1.01  2030 x 1356                                       
   Band: 18   0.9353 um Atmospheric Water Vapor         1.01  1.01  2030 x 1356                                       
   Band: 19   0.9361 um Atmospheric Water Vapor         1.01  1.01  2030 x 1356                                       
   Band: 20   3.7882 um Surface/Cloud Temperature       1.01  1.01  2030 x 1356                                       
   Band: 21   3.9921 um Surface/Cloud Temperature       1.01  1.01  2030 x 1356                                       
   Band: 21   3.9921 um Surface/Cloud Temperature       1.01  1.01  2030 x 1356                                       
   Band: 22   3.9719 um Surface/Cloud Temperature       1.01  1.01  2030 x 1356                                       
   Band: 23   4.0567 um Surface/Cloud Temperature       1.01  1.01  2030 x 1356                                       
   Band: 24   4.4732 um Atmospheric Temperature         1.01  1.01  2030 x 1356                                       
   Band: 25   4.5454 um Atmospheric Temperature         1.01  1.01  2030 x 1356                                       
   Band: 26   1.3820 um Cirrus Cloud Water Vapor        1.01  1.01  2030 x 1356                                       
   Band: 27   6.7654 um Cirrus Cloud Water Vapor        1.01  1.01  2030 x 1356                                       
   Band: 28   7.3367 um Cirrus Cloud Water Vapor        1.01  1.01  2030 x 1356                                       
   Band: 29   8.5288 um Cirrus Cloud Water Vapor        1.01  1.01  2030 x 1356                                       
   Band: 30   9.7344 um Ozone                           1.01  1.01  2030 x 1356                                       
   Band: 31   11.0186 um Surface/Cloud Temperature      1.01  1.01  2030 x 1356                                       
   Band: 32   12.0325 um Surface/Cloud Temperature      1.01  1.01  2030 x 1356                                       
   Band: 33   13.3651 um Cloud Top Altitude             1.01  1.01  2030 x 1356                                       
   Band: 34   13.6835 um Cloud Top Altitude             1.01  1.01  2030 x 1356                                       
   Band: 35   13.9133 um Cloud Top Altitude             1.01  1.01  2030 x 1356                                       
   Band: 36   14.1957 um Cloud Top Altitude             1.01  1.01  2030 x 1356                                       
   Band: 37   0.6656 um hi Ocn Color/Plankton/Biogeoch  1.01  1.01  2030 x 1356                                       
   Band: 38   0.6767 um hi Ocn Color/Plankton/Biogeoch  1.01  1.01  2030 x 1356                                       

uncompressed:  209564760 (204.7 mb)
compressed:     43149434 (41.4 mb)
ratio:            0.2059 (20% of original file size remains)

Now, let's load in some data:
  1. If other displays and data are already loaded, select the Edit->Remove All Displays and Data menu item or the icon in the toolbar to clear them out.
  2. Open the Sample MODIS Data Mongolia by clicking on the corresponding bundle in the NGIC Workshop Bundles toolbar.
  3. Select in the Field Selector Show popup any of the available channels and click on the Create Display button. You should see something like this in your main window, but your display maybe different:
Sample MODIS

Next, we'll load in some visible imagery from the FY-2C/VISSR, a 5 channel imager (1.25 km VIS, 5 km IR) covering a large part of Asia:   

     FY2C DATA

     Server/group/dataset information for FY2C can be found at the
     end of this file.

     Normally, full disk images are sent hourly, at hh00, and Northern  
     Hemisphere images are sent hourly, at hh30.   

     The FY-2C data are received by ITC via ADDE relay from the Austrailian Bureau of
     Meteorology (ABOM).

     Server/group/dataset information:
           
       Spacecraft:        FY2C
       Subpoint:          105E (average)
   
       ADDE Group:                PUB
       ADDE Server/address     GP16.SSD.NESDIS.NOAA.GOV
   

       ADDE SERVER INFO:
 
       Dataset             Description/Content
       --------               -----------------------
       FY2C-CH1           FY2C VIS .73 um Cloud and Surface Features
       FY2C-CH2           FY2C IR 10.8 um Surface/Cloud top temperature
       FY2C-CH3           FY2C IR 12.0 um SFC/Cloud Temp Low-level WV
       FY2C-CH4           FY2C IR  6.8 um Mid-level Water Vapor
       FY2C-CH5           FY2C IR  3.8 um low-level cloud/fog and fire detection

  1. If other displays and data are already loaded, select the Edit->Remove All Displays and Data menu item or the icon in the toolbar to clear them out.
  2. Open the Data Source Chooser. Show popup Click on the Images tab.
  3. We'll load in some visible satellite imagery. In the Server: selector, choose GP16.SSD.NESDIS.NOAA.GOV. In the Dataset: selector, choose PUB. If either of these is not in the list, just type them in. When you have made your selections, click the Connect button.
  4. The IDV connects to the specified server and retrieves the types of images available in the dataset. 
  5. From the Image Type: selector, choose the FY2C-CH1 type (High resolution 1.25km, 0.73 um VIS for detecting Cloud and Surface features).Data selector
  6. You can either load in the last "n" images, or you can select by time. For this exercise, we do not want to select a subset of all available times, so click on the Relative times radio button. When the Absolute times option is selected, the server is queried for a set of available times for that type and these are listed in the Times: panel. Select Show popup the 5 most recent images from the list. Make sure you subset the image using Image size parameters as depicted above (lines: 600, elements: 1700), and that your Location parameters are also set correctly to subset the whole image disk to only Mongolia. Be sure that the Create display checkbox is selected and click the Add Source button.
  7. Change the background maps using the Default Background Maps Control. Show popup Turn on the World Country Outlines. Make sure all other maps are off. When you are finished, go back to the Display Window.
  8. Use the Displays->Locations->World->Asia menu to overlay some place names. Change the color of the location text to be white using the display control's Edit->Color menu, or the Color button in the control's legend.
  9. Start the animation. In this loop, you will see the latest cloud cover and surface features with a 4 hour timelag with the current time. Stop the animation.
  10. Change the colors of the Imagery display by clicking the colorbar with your right-mouse button and selecting Satellite->Light Gray Scale.
  11. Change color in image display
  12. This is visible imagery at 1.25 kilometer resolution. You can use the Pixel Sampling slider to see what the image would look like at a lower resolution.

 


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Unidata IDV Workshop for version 2.1 > Accessing and Displaying Data > Displaying Satellite and Level III Radar Imagery